The evolution of flavor represented in Americans’ diet over the course of U.S. history has gone from a timid, “lightly salted” hint to today’s loud barrage of often bewildering tastes. During a recent grocery trip, I was in the snack aisle and was stopped dead in my tracks by an almost psychedelically colorful tower of products. It was the magical land of Pringles, standing out with gaudy insistency.